Last-engaging dog for last lathes



Ma as, 1924.

W. H. KAY

LAST ENGAGING DOG FOR LAST LATHES Filed June 16. 1923 java 12367 a; 1- "My Jig 1' f Z I F Patented May 13, 1924.

UNITED STATES WILLIAM H. KAY, 0F swami soo rtr, MASSACHUSETTS.

LAST-ENGAGING Doe non LAST. LA'lI-IES.

' Application filed June 16,

To aZZ whom/it may concern.

Be it known that I, lVILLIAM H. KAY, a citizenof the United States, residing at Swampscott, in the county of Essex and v State of Massachusetts, have inventednew and useful Improvements in Last-Engaging Dogs for Last Lathes, of which the following is a specification] 1 p 'This invention relates chiefly to last lathes for returning an old last which is of obsolete form, or has been rendered by wear incapable of further use, the size of the last being such thatit may be converted into a smaller last by a re-turning operation performed by a last lathe, the shape or style of the last being at the same time suitably changed. I e p The invention is an improvement on the dog disclosed by Letters Patent of the United States, No. 1,368,035, granted to me February 8, 1921, said dog being adapted to be engaged with the live spindle of a last lathe, and to centralize the heel end of'the last relatively to the spindle, and to securely engage the last while rotating it. i

The present invention is embodied in a dog constructed as set forth by said patent and provided with a rest for the heel seat portion of the last, whereby the last maybe more securely supported than heretofore, while 'beingrotated.

In a last lathe two dogs, each embodying the invention, are employed, one engaging the heel end of a pattern last, and the other the heel end of a last to be re-turned.

Of the accompanying drawings forming a part of this specification,--

Figure 1 is a view showing partly in plan, and partly in section, various parts of a last lathe including two heel-engaging dogs, each embodying the invention.

- Figure 2 is a plan view, and

Figure 3 is an end view of one of the said dogs.

Figure 4B is a section on line 44 of Figure 3.

Figure 5 is an end View of the other dog.

Figure 6 is a section on line 66 of Figure 5.

The same reference characters indicate the same parts in all the figures.

14 rep-resents a pattern last, and 15 a last which is to be, or has been re-turned by a last lathe, said lasts being mounted in the swinging holder of an ordinary lathe, the

1923. Serial Np. 645,925.

pattern last be aring on the pattern wheel 16,-a'nd the last lobeing acted on by the rotary-cutter head 17.

The heel end of each last is engaged by a dog embodying the in'vention, t'he dogs in this instance being of identical construction, excepting as to the means for coupling them to the usual live spindles of the lathe,

whereby thedogsi'and the lasts engaged thereby arerotated.

Each dog includes a substantially 'cylin'-' drical body, 18, provided" at its outer end witha transverse end face 19, and with lastcentering means embodied ina" pair of ears 20, projecting from one edge of the'end face and having converging edges 21, adapt ed to bear simultaneously on opposite sides of the heelend portion of a last, sot-hat longitudinalpressure exerted by the usual adjustable dog 22, constituting a part of the loosely rotating or dead spindle of. the

lathe, centralizes the heel end by forcing it toward the apex of the notch formed by the edges'21;

The end face 19 is offset inwardly f rom said notch to permit various inclinations of the hel end of the last, as'in'dicatedby the dotted, lines 0c g ,y,-y and 2+2, Figure 4. F rom th'e end facel19'projects a fixed spur 24, which iscoaxial withthe' body 18, and is adapted to enter an indentation previouslyformed for its reception in the heel end of the last.

lVhen the last is operatively installed, its toe end is engaged by the loosely rotating dog 22, and its heel end is impaled on the spur 24, and gripped between the ears 20. of the positively rotated dog 18, so that the last is positively rotated, its heel end being positioned in accordance with the location of the indentation entered by the spur 24. The last is automatically centered by the converging edges 21, and its longitudinal inclination is determined by the location of said indentation.

Each dog is provided with coupling means, adapted to be interchanged with complemental coupling means on the corresponding live spindle, the coupling means on each dog being preferably a socket 26, into which opens a slot 27, said socket and It is often desirable to rota-tively adjust the dog which engages the heel end of the last 15. To permit this rotative adjustment the socket 26 in each dog may be formed in a bushing 29, on which the dog is rotatable, the socket 26 and slot 27 being formed in said bushing. Said dog is provided with a cavity, the wall 30 of which embraces the bushing 29. In the dog shown by Figures 5 and 6 said wall is compressible on the bushing, the wall of said socket being provided with slots 30. A clamp 31 embracing the compressible wall 30, and including ears and a clamping bolt 33, is adapted to compress said wall on the bushing 29, and thus secure the dog to the bushing, after the dog has been turned on the bushing 29 to the desired position. In the dog shown by Figures 2, 3 and 4, the socket wall is not compressible and is provided with a set screw 35 engaged with an external collar 37, and with a tapped orifice in the socket wall, to confine the bushing 29 against rotation.

The dog as thus far described is substantially identical with the dog disclosed by the above-mentioned patent.

I have found that in some cases the heel end of the last is liable to be accidentally displaced from the position in which it is intended to be held by the ears 20 and the spur 24. To prevent this liability I pro vide the dog with a rest for the heel seat portion of the last, said rest being formed to project forward from the body 18 at one side of the axis thereof, and to bear on the heel seat portion of the last as indicated by Figure 4. The rest is adjustable relative to the body 18, so that it may be adjusted toward and from the axis of the body, means being provided for positively securing the rest to the body in any position to which it may be adjusted.

The rest is preferably an arm 38, forked at one end to form diverging fingers 39, adapted to bear simultaneously on the bottom or heel seat portion at the rear end of the last. A shank d0 formed on the arm 38 and perpendicular thereto, is slidable in a transverse socket 41 in the body 18, and is secured therein by a set screw l2.

The rest enables the dog to positively support the heel end of the last against movement in any direction crosswise of its axis of rotation.

I claim:

A last dog comprising a body adapted to be coupled to the live spindle of a lathe in a position coaxial with said spindle, a pair of centering ears projecting from the outer end of the body and adapted to bear on opposite sides of the heel end of a last, and a heel end-engaging spur co-axial with the dog, the form and arrangement of said body, ears and spur being such that the last may swing on the spur, and its heel end may stand at various inc-llnations while engaged with said spur, and supported laterally by said ears. the dog being characterized by a rest adjustable on the body and formed to project forward from the body at one side of the spur, and to constitute a support on which the heel seat portion of a last is movable to permit various inclinations of the heel end, on the spur, means being provided for securing said rest to the body at different distances from the spur.

In testimony whereof I have aflixed my signature.

WILLIAM H. KAY. 

